Dog Food Dry Matter Basis for Protein, Fat, and Carb Analysis

Pet owners often wonder whether their dog food is high in protein, fat, or carbohydrates- the macro nutrients of the food. Unfortunately, the answer to these questions is not easily attainable from the dog food label. To calculate a dog food’s protein, fat, or carb values, the guaranteed analysis on the label must first be converted to a dry matter basis. This article, which is an update on a previously published piece, will demonstrate how to do this.

Guaranteed Analysis

Let’s start by looking at the typical food label guaranteed (or crude) analysis which displays the relative amounts of the macronutrients. Most labels show you the percentages for the following:

  • Protein
  • Fat
  • Fiber
  • Moisture

As you can see, there is no mention of the carbohydrate content. But that doesn’t mean that we can’t determine that component value.

Before we show the calculation, we must take a side step and discuss another ingredient that isn’t often listed, Ash. The ash content in a food is needed to more accurately estimate the carbohydrate content.

What is Ash?

Ash is the inorganic material that remains after organic material is burnt up. Ash is made up of mineral nutrients like calcium, phosphorous, zinc, iron, etc. …read more

From: Dog Food Dry Matter Basis for Protein, Fat, and Carb Analysis